US3852698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual temperature thermostat
Assignee: Therm O Disc Inc
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Filing: 1973-07-23
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Granted: 1974-12-03
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Expires: 1993-07-23
Abstract
Abstract A dual temperature thermostat is disclosed in which two separate bimetallic snap discs are connected to independently operate separate switches. One snap disc is supported at its periphery and provides a central portion movable with snap action to operate the disc. The other snap disc is supported at its center and one peripheral location to provide an opposite peripheral portion which snaps back and forth to operate the other switch. In one embodiment, the bumper connecting the peripheral portion and such other switch engages the mobile contact arm at its end and extends through a lateral clearance opening in the first disc. A locating pin cooperates with a mounting cup to insure that frictional engagement does not exist between the bumper extending through the disc opening. In another embodiment, one bumper engages the center of one disc and extends through a central opening in the other disc. The center of such other disc engages an adjustable tubular screw at its center.
Inventors
- 👤 D Schmitt
- 👤 R Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:56
CPC Classifications
H; H01; H01H; H01H37/00; H01H37/006; H01H37/02; H01H37/32; H01H37/52; H01H37/54
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
110 words
A thermostat comprising a body assembly, first and second switches mounted on said body assembly, first and second bimetal snap discs on said body assembly, said first disc being supported at its periphery and providing a central portion movable with snap action in response to temperature changes, said first switch providing first means operating said first switch in response to movement of said central portion, said second disc being mounted at its center and at one peripheral location and providing a peripheral portion movable with snap action in response to temperature changes, said second switch providing second means operating said second switch in response to movement of said peripheral portion.
Claim 2
Dependent Claim
110 words
A thermostat comprising a body assembly, first and second switches mounted on said body assembly, first and second bimetal snap discs on said body assembly, said first disc being supported at its periphery and providing a central portion movable with snap action in response to temperature changes, said first switch providing first means operating said first switch in response to movement of said central portion, said second disc being mounted at its center and at one peripheral location and providing a peripheral portion movable with snap action in response to temperature changes, said second switch providing second means operating said second switch in response to movement of said peripheral portion.
Claim 3
Dependent Claim
21 words
A thermostat as set forth in claim 1 wherein said discs are substantially circular and coaxially mounted in said body assembly.
Claim 4
Dependent Claim
49 words
A thermostat as set forth in claim 2 wherein said first means includes a first elongated bumper movable along the axis of said first disc, said first bumper being sized to provide lost motion to insure that said first disc is in snap movement before said first switch opens.
Claim 5
Dependent Claim
56 words
A thermostat as set forth in claim 3 wherein said second means includes a second elongated bumper movable along a line of action extending between said peripheral portion and said second switch, said second bumper being sized to provide lost motion and insure that said second disc is in snap movement before said second switch opens.
Claim 6
Dependent Claim
38 words
A thermostat as set forth in claim 4 wherein said second switch includes a movable contact support arm cantilevermounted on said body assembly and providing a free end, and said second bumper is engagable with said free end.
Claim 7
Dependent Claim
20 words
A thermostat as set forth in claim 5 wherein both of said bumpers move along substantially parallel lines of movement.
Claim 8
Dependent Claim
40 words
A thermostat as set forth in claim 6 wherein a locating pin is mounted on said body assembly to support said one peripheral location, and said first disc is provided with a first opening through which said locating pin projects.
Claim 9
Dependent Claim
27 words
A thermostat as set forth in claim 7 wherein said first disc is provided with a second opening, and said second bumper extends through said second opening.
Claim 10
Dependent Claim
32 words
A thermostat as set forth in claim 8 wherein said first opening provides less clearance with respect to said locating pin than said second opening provides with respect to said second bumper.
Claim 11
Dependent Claim
33 words
A thermostat as set forth in claim 9 wherein both of said openings through said first disc have the same diameter, and said locating pin has a larger diameter than said second bumper.
Claim 12
Dependent Claim
52 words
A thermostat as set forth in claim 1 wherein said second switch includes a movable contact support arm cantilever-mounted on said body assembly and providing a free end, and said second switch also including an elongated bumper movable along a line of action extending between said peripheral portion and said free end.
Claim 13
Dependent Claim
40 words
A thermostat as set forth in claim 1 wherein a locating pin is mounted on said body assembly to support said one peripheral location, and said first disc is provided with a first opening through which said locating pin projects.
Claim 14
Dependent Claim
48 words
A thermostat as set forth in claim 12 wherein said first disc is provided with a second opening, and said second switch includes an elongated bumper extending through said second opening and operable to open and close said second switch in response to movement of said peripheral portion.
Claim 15
Dependent Claim
32 words
A thermostat as set forth in claim 1 wherein said discs are the same size, and retainer means formed of a material having good heating conducting properties supports both of said discs.
Claim 16
Dependent Claim
32 words
A thermostat as set forth in claim 14 wherein said retainer means includes a disc cup formed with a shoulder supporting said first disc and a support plate supporting said second disc.
Claim 17
Dependent Claim
31 words
A thermostat as set forth in claim 15 wherein said support plate provides a central projection operable to engage and locate the central portion of said second disc when it snaps.
Claim 18
Dependent Claim
17 words
A thermostat as set forth in claim 16 wherein the position of said central projection is adjustable.
Claim 19
Dependent Claim
25 words
A thermostat as set forth in claim 17 wherein said second disc is formed with a central opening through which said first operating means projects.
Claim 20
Dependent Claim
25 words
A thermostat as set forth in claim 1 wherein said second disc is formed with a central opening through which said first operating means projects.
Claim 21
Dependent Claim
117 words
A thermostat comprising a body assembly including a disc retaining means formed of thermally conductive material, first and second switch means mounted on said body assembly, a first surface in said retaining means, a bimetal snap disc supported at its periphery on said first surface, a second surface on said retaining means, a second bimetal snap disc supported at its periphery against said second surface when in one of its snap positions, said first disc operating said first switch means, said second disc providing a peripheral portion movable with snap action and away from said second surface when predetermined temperatures are reached, said second switch means being operated in response to snap movement of said peripheral portion.
Claim 22
Dependent Claim
117 words
A thermostat comprising a body assembly including a disc retaining means formed of thermally conductive material, first and second switch means mounted on said body assembly, a first surface in said retaining means, a bimetal snap disc supported at its periphery on said first surface, a second surface on said retaining means, a second bimetal snap disc supported at its periphery against said second surface when in one of its snap positions, said first disc operating said first switch means, said second disc providing a peripheral portion movable with snap action and away from said second surface when predetermined temperatures are reached, said second switch means being operated in response to snap movement of said peripheral portion.
Claim 23
Dependent Claim
59 words
A thermostat as set forth in claim 20 wherein a locating means is provided on said body assembly engaging said disc at a peripheral location opposite said peripheral portion on the side thereof opposite said second surface, and support means are provided to engage the center part of said second disc on the side thereof opposite said locating means.
Claim 24
Dependent Claim
24 words
A thermostat as set forth in claim 21 wherein said first disc is provided with a first opening through which said locating means projects.
Claim 25
Dependent Claim
41 words
A thermostat as set forth in claim 22 wherein said second switch means includes an elongated bumper extending between said second switch and said peripheral portion, and said first disc includes a second opening through which said bumper projects with clearance.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |